A ring of mass M and radius R is held at rest on a rough horizontal surface. A rod of mass M and length `L = 2 sqrt3 R` is pivoted at its end A on the horizontal surface and is supported by the ring. There is no friction between the ring and the rod. The ring is released from this position. Find the acceleration of the ring immediately after the release if `theta = 60^(@)`. Assume that friction between the ring on the horizontal surface is large enough to prevent slipping of the ring.

Answer

`a = (g)/(4 sqrt3)`